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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: neolib who wrote (312453)	11/26/2006 7:56:03 PM
From: combjelly	Respond to of 1585085

"I like to grow tropical trees in my office, but have never kept fish." Fresh water tends to have more variable chemistry, so the organism are more tolerant. Salt water is very different. It is very challenging to keep a good tank with things like corals. In open ocean, you talk about the constancy of ions, the most common ions exist in the same ratios(within very narrow bounds) all over the globe. There can be some local dilution so the amounts can vary a little, but even that is usually limited. When it isn't, then only the most hardy species survive. Take the Texas Gulf Coast. Between the Mississippi and the other rivers, there is a large amount of freshwater influx. So the salinity can be as low as 22 ppt near shore instead of the more normal 35. As a result, there are many organisms that can't live here like starfish and horseshoe crabs. Now organisms adapted for bays do fine. But those adapted for open ocean are only encountered when you go far offshore.